Tissue ScaffoldsBiodegradable PlasticsTissue EngineeringBiocompatible MaterialsPorosityPolyurethanesPolyestersMaterials TestingTissue DistributionOrgan SpecificityNanofibersLiverKidneyRats, Inbred StrainsMolecular Sequence DataPolyglycolic AcidAbsorbable ImplantsDecanoatesAmino Acid SequenceRats, Sprague-DawleyMicroscopy, Electron, ScanningPolymersRNA, MessengerBone RegenerationBrainBase SequenceRats, WistarCloning, MolecularGuided Tissue RegenerationSilkDurapatiteBiomimetic MaterialsBone Substitutes